This is a video about the impacts of global warming on polar bears and the Arctic.
From Associated Press in the USA:
Among other things, the script, or official text, of last year’s exhibit was rewritten to minimize and inject more uncertainty into the relationship between global warming and humans, said Robert Sullivan, who was associate director in charge of exhibitions at the Smithsonian’s National Museum of Natural History.
See also here.
Update 16 november 2007: here.
Bush’s censorship of Surgeon General: here.
Scientists on big Arctic iceberg: here.